Method and apparatus for compressing parameter values for pixels in a display frame
US6476811B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1999 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Sep 1, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for compressing parameter values for pixels within a frame is accomplished by first grouping pixels in the display frame into a plurality of pixel blocks, where each pixel block includes a plurality of pixels. For at least one of the pixel blocks, the parameter values for the pixel block are translated into a column-wise differential slope representation that represents the parameter values as a plurality of reference points, a plurality of slopes, and a plurality of slope differentials. The column-wise differential slope representation is then transformed into a planar differential slope representation that reduces the representation of the plurality of reference points and the plurality of slopes to a single reference pixel value, two reference slopes, and a plurality of slope differentials. An output format representation of the planar differential slope representation is then generated, where encoding of the slope differentials allows the parameter values for the pixel block to be compressed. This compressed format representation of the parameter values can then be stored in and retrieved from memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.